I running 1.5.0.6 just the default automatic updates (no beta stuff)
just had a look at the file to download does look like php code that is not been run server side below is the first couple of lines...
PHP Code:
<?php
/*======================================================================*\
|| #################################################################### ||
|| # vBulletin 3.5.2 - Licence Number 7352c42a
|| # ---------------------------------------------------------------- # ||
|| # Copyright ©2000-2005 Jelsoft Enterprises Ltd. All Rights Reserved. ||
|| # This file may not be redistributed in whole or significant part. # ||
|| # ---------------- VBULLETIN IS NOT FREE SOFTWARE ---------------- # ||
|| # http://www.vbulletin.com | http://www.vbulletin.com/license.html # ||
|| #################################################################### ||
\*======================================================================*/
// ####################### SET PHP ENVIRONMENT ###########################
error_reporting(E_ALL & ~E_NOTICE);
// #################### DEFINE IMPORTANT CONSTANTS #######################
define('THIS_SCRIPT', 'index');